Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id gBD2pkC28079 for ; Thu, 12 Dec 2002 20:51:46 -0600 X-ClientAddr: 209.68.248.164 Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id gBD2pj328072 for ; Thu, 12 Dec 2002 20:51:45 -0600 Received: from fatcity.UUCP (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id PAA64390; Thu, 12 Dec 2002 15:34:08 -0800 (PST) Received: by fatcity.com (26-Feb-2001/v1.0g-b72/bab) via UUCP id 00518F13; Thu, 12 Dec 2002 14:39:02 -0800 Message-ID: Date: Thu, 12 Dec 2002 14:39:02 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: DENNIS WILLIAMS Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: DENNIS WILLIAMS Subject: RE: UNDO RETENTION Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 72; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Paula - Oracle has added a new table in 9i to help your analysis. V$UNDOSTAT has a column MAXQUERYLEN that lists the longest query time, and can provide a guide. SSOLDERRCNT column counts the number of snapshot too old errors in a time period. In theory this should assist you in deciding whether your undo tablespace is large enough. Dennis Williams DBA, 40%OCP Lifetouch, Inc. dwilliams@lifetouch.com -----Original Message----- Sent: Thursday, December 12, 2002 3:54 PM To: Multiple recipients of list ORACLE-L Having had frustration with rollback segments from time to time over the years I am happy to let Oracle handle it with their recommended automatic undo management and a defined undo tablespace. However, it isn't that simple is it? I imagine that undo retention is critical and if you specify too long you might have problems with performance while too little and what you loose read-consistency - any ideas on the best way to configure this little bugger? -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: DENNIS WILLIAMS INET: DWILLIAMS@LIFETOUCH.COM Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).